Kingdom Hearts Coded[a] is an episodic action role-playing puzzle video game developed and published by Square Enix, in collaboration with Disney Interactive Studios, for mobile phones.

A Nintendo DS remake, titled Kingdom Hearts Re:coded, was released in Japan, North America, Europe, and Australia.

This leads King Mickey and his friends to make a digital Sora to enter and repair the journal so that the meaning of the hidden messages can be deciphered.

Kingdom Hearts coded is a puzzle game with action elements mixed into the gameplay,[8] which is similar to the action-RPG style of the previous titles in the series.

[12] The game is set after Kingdom Hearts II and follows the story of Jiminy Cricket, Mickey Mouse, Donald Duck and Goofy in Disney Castle.

[5] The main protagonist and sole player character of the game is an artificially intelligent virtual avatar of Sora, occasionally referred to in-game as "Data-Sora", created from the data from Jiminy's journal entries.

[9] Some characters include King Mickey Mouse, Pluto, Jiminy Cricket,[16] Donald Duck, and Goofy,[10] the latter two of whom appear as computer-controlled partners of Sora in one of the game's levels.

[17] Jiminy Cricket organizes his journals chronicling Sora's journeys when he discovers a line he does not remember writing: "We must return to free them from their torment.

"[b] King Mickey digitizes the contents of the journal to investigate this message, only to find the datascape has been corrupted with bugs, which take the form of red-and-black blocks and Heartless.

Mickey creates a virtual Sora named "Data-Sora" to guide him through the datascape's multiple worlds and debug the journal by destroying the blocks and digitized Heartless that appear.

Mickey guides the reset Sora to an extra world based on Castle Oblivion, where he is tested by a virtual Roxas to endure the pain of forgetting his friends.

There he and Mickey encounter a virtual Naminé, who reveals the real Naminé was the one who left the message after discovering a set of memories relating to people tied to the real Sora's heart—herself, Roxas, Axel, Xion, Terra, Aqua, and Ventus—while restoring his lost memories; the bugs are also revealed to have been an unintentional side effect of her message.

In mid-2007, Nomura mentioned a desire to create a spin-off Kingdom Hearts game on a mobile platform and wanted it to play slightly different than other titles in the series.

The story was initially supposed to be "fluid" and did not fit into the chronology of the Kingdom Hearts series, but later developers tied the game's final chapters into Birth by Sleep and 358/2 Days.

[31][32] Because many mobile games offer free content, Nomura planned to try a new business model from Square Enix's usual practice in order to lower barriers to entry.

[25] The scale of the game grew so large that the Square Enix team in Osaka that had worked on Kingdom Hearts Birth by Sleep was brought in to assist.

[12][40] The story of the remake did not change, although more scenes were added, including a new secret movie and a few hints about the then-unreleased Kingdom Hearts 3D: Dream Drop Distance.

[42] On October 14, 2013, Square Enix announced that Re:coded would be part of the Kingdom Hearts HD 2.5 Remix collection, released exclusively on the PlayStation 3.

"[54] Official Nintendo Magazine stated that "While it may suffer from some unforgivable camera problems, it is a decent game for Kingdom Hearts fans and will keep them entertained until Dream Drop Distance comes out".

"[51] Jamin Smith of VideoGamer.com said, "While this latest Kingdom Hearts has its fair share of problems, long-term fans shouldn't find it too hard to forgive and forget.

[57] "Kat Bailey of G4tv stated "It's obviously no Kingdom Hearts III -- it's not even a Birth by Sleep -- but as an appetizer for better things to come (like the forthcoming 3DS game), it will suffice.